code: def now(key, request):
      if key == "epoch":
          return int(time.time())
      elif key == "date_utc":
          return datetime.datetime.utcnow().date().isoformat()
      elif key == "datetime_utc":
          return (
              datetime.datetime.utcnow().strftime(r"%Y-%m-%dT%H:%M:%S")
              + "Z"
          )
      else:
          raise KeyError
  
file_path: datasette/datasette/default_magic_parameters.py
imports: from datasette import hookimpl
  import datetime
  import os
  import time
label_desc: Use image node_id 4 for calling a global function with example usage: now(key, request) and returns: int, datetime, unknown